Tools for injecting materials into wood



July 25, 1961 s. H. REECE TOOLS FOR INJECTING MATERIALS INTO WOOD 2Sheets-Sheet 1 Filed Nov. 24, 1958 HHIII Inventor ST NLEY f/f/vev REL-c5Attor ey July 25, 1961 s, REECE 2,993,245

TOOLS FOR INJECTING MATERIALS INTO WOOD Filed Nov. 24, 1958 2Sheets-Sheet 2 Fig.3

In ventor Sm/v1.5) HEN/er 1C J riw W Attorney United States PatentOfiice Patented July 25, 1961 TOOLS FOR INJECTING MATERIALS INTO WOODStanley Henry Reece, Morden, England, assignor to Cobra (Wood Treatment)Limited, London, England,

a British company Filed Nov. 24, 1958, Ser. No. 776,070 Claims priority,application Great Britain June 14, 1958 2 Claims. (Cl. 21-73) Thisinvention relates to tools for injecting materials into wood.

The material to be injected is usually a liquid or viscous antisepticproduct but may be a colouring or fireproofing substance, and the toolis used for injecting, for example, wooden poles or trees.

According to the present invention, we provide in or for a tool forinjecting materials into wood, an injection head comprising a cylinderfor the material to be injected, a piston in the cylinder, and holdersfor two needles adapted to be fed from the cylinder upon needlepenetration of the wood and operation of the piston by its contact underpressure with the wood surface.

An embodiment of the invention will now be described, by way of example,with reference to the accompanying drawings, in which:

FIG. 1 is a fragmentary front end elevation of the tool,

FIG. 2 is a side elevation corresponding to *FIG. 1,

FIG. 3 is an inverted plan view of FIG. 2, and

FIG. 4 is a fragmentary sectional view on the line IVIV of FIG. 1, andshowing a needle.

Referring to the drawings, the tool head consists of a body member 5formed with a cylindrical through hole 6 closed at one end, its rearend, by a removable screwthreaded cap 7, so as to form the cylinder of apiston and cylinder device, the cap 7 being screwed on to ascrew-threaded spigot SA on the body member 5. The cylinder 6 has aliner 8 held in position by said cap 7 and a piston 9 is slidablymounted in the liner 8, the piston having a domed enlargement 9a andhead 9b. The liner 8 projects beyond the front end of the cylinder 6 anda compression spring 10 (see FIG. 4) is provided around the piston andprojecting portion of the liner 8 and at one end abuts the enlargement9a and at its other end abuts the face of the body member 5 around thecylinder 6. The front or outer end of the liner 8 acts as a stop todetermine the end of the inward or working stroke of the piston 9 andthe projecting portion of the liner 8 prevents distortion of thecompression spring 10.

A lug 1 1, FIG. 2, is provided on the piston head 9a and a guide rod 12is fixed thereto. The rod 12 is slidably mounted on a pair of lugs 13,14 fixed externally on the body 5 and a nut 15 is provided at the end ofthe rod 12 and acts as a stop to limit the return stroke of the pistonwhen the nut 15 abuts the lug 14.

The cylinder 6 has two radially directed and circumferentiallyinterspaced outlet ports -16, 17 in its peripheral wall and located atthe inner end of the piston, and the liner 8 is, of course, similarlyported. The outlet ports 16, -17 open into two ducts 18, 19 which extendthrough the body member 5 parallel to the cylinder axis and at theirouter or front ends open into tapped sockets 20, and an injector needle21, FIG. 4, is screwed into each of said sockets. The cylinder 6 has afurther port 22 communicating with a reservoir 23 and said port 22 isclosed by the piston 9 on inward movement thereof. The domed enlargement9a of the piston 9 lies behind the points of the needles in theinoperative position, and the relative position of the needles andpiston head can be adjusted by adjustment of the guide rod aforesaidand/ or by screwing or unscrewing of the needles in their sockets. Inthe drawings, the piston is shown at the end of its working stroke.

The injection head is operated by levering it by a long handle, notshown, around a fulcrum point at a short distance from the head andsupported by a collar or chain connecting the tool to, for example, awooden pole. The needles are thus forcibly driven into the wood, andafter they have penetrated a predetermined distance, the pistonenlargement abuts the wood and is pushed inwards on further penetrationof the needles to force the materials from the cylinder through theneedles into the pole.

Modifications may be made without departing from the scope of theinvention.

I claim:

1. In a tool having needles being forced into wood by a levering actionand for injecting material into the wood comprising a body member, areservoir for the injecting material connected to said body member, acylinder closed at one end and arranged in said body member andcommunicating with said reservoir, a piston having a piston head on oneend and an enlargement on the other end and arranged in said cylinder,spring means mounted around said piston between said body member andsaid enlargement to maintain said piston in a withdrawn inoperativeposition, stopping means arranged within said cylinder to stop saidpiston at the end of its operating stroke, two radially directed andcircumferentially interspaced outlet ports connected to said cylinder atsaid closed end, two ducts communicating with said outlet portsextending through said body member parallel to the axis of saidcylinder, said ducts opening into sockets, and two injector needlesdisposed in a horizontal plane and arranged in said sockets at the sameend of said body member as said piston enlargement, said piston beingoperated to inject material into the wood by its contact with and uponpenetration of said needles into the wood, the two needles and the axisof the piston forming a triangular configuration to aid uniforminsertion of the needles into the wood and reduce stresses that ariseupon use of the tool.

2. In a tool according to claim 1 in which said stopping means is aliner disposed within said cylinder and projects beyond one end of same.

References Cited in the file of this patent UNITED STATES PATENTS955,422 Morin Apr. 19, 1919 1,661,595 Bowen Mar. 6, 1928 2,261,868*Hecht Nov. 14, 1948 FOREIGN PATENTS 767,834 France July 25, 1934429,370 Italy Ian. 24, 1948 614,579 Great Britain Dec. 17, 1948 677,364Great Britain Apr. 13, 1952 177,252 Austria Jan. 11, 1954 935,501Germany Nov. 24, 1955

